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190124
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A takes 4 hours to complete a task alone. It takes 3 hours for A and B to finish the task at the same time. How many hours does it take for B to finish the task alone?
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190124
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y=x+$$\frac{1}{x}$$-1(x≠0) .How to express x with y?
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190124
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A positive integer N is a multiple of 5. What is the remainder of N divided by 6?
1: When N is divided by 4, the remainder is 3.
2: When N is divided by 12, the remainder is 3.
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190124
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The price of 1kg salad is fixed. Someone took 9 dollars and went to the shop. Then, he found that he remembered a wrong price. The price he thought was $0.2/kg less than the actual price. As a result, the weight of the salad that he bought was 0.5 kg less than that in his mind. How much is the actual value of 1 kg salad?
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190124
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140 cards are given to m children (m≥2). Each person can receive the same number of cards. What`s the possible value of m?
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190124
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There is a stack of cards. 9 cards are blue and the rest are red. The probability of taking out two cards randomly that are both blue is 1/7. What`s the number of the red cards?
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190124
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The size of the rectangular ground is 12 feet * 9 feet. If the ground is covered with square tiles whose length is 9 inches. How many tiles are needed? (1 foot = 12 inch)
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190124
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$$(\sqrt{\sqrt{2}}$$+$$\sqrt{\sqrt{8}})^{2}$$ = ?
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190124
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Which of the following lines has only one point, whose x and y coordinates are integers?
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190124 还原机经选题: 文字题&几何
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The shop sold two shirts and one belt at a discount. What's the average discount?
1: Each shirt was 20% off.
2: The belt was 10% off.
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190124
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x and y are two integers between 2-20 (Both boundaries are included.). Do x and y have the same prime factor?
1:x=y+1
2:y is odd.
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190124 还原机经选题: 文字题&几何
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The traffic lights are alternating in the order of green, yellow and red. The time for the green, yellow and red lights is 45s, 5s, and 45s, respectively. What can be the longest time that the red light is on within 5 minutes?
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190124
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The swimming pool will be filled with water whose rate of flow is 50 L/min. The pool is 120 $$m^{3}$$ in total. How many hours is necessary to fill 2/3 of the pool?
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190124 还原机经选题: 文字题&几何
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The center of circle O is the coordinate origin. The radius of the circle is 50.p($$x_p$$,$$y_p$$) and Q(50,0) are all on the circle. What is the distance of PQ?
1:$$x_p$$=-30
2:$$y_p$$=-40
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190124
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Does the equation have at least one solution?
1:a > 0
2:c < 0
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190124
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p,s,t are prime numbers. $$p^{3}s^{3}t^{3}$$=?
1:$$p^{3}st$$=728
2:t=13
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190124 还原机经选题: 文字题&几何
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Two numbers will be chosen from the sequence {1,2,3,5,6,10} and {1,2,3,5,7}, one from each sequence. What`s the probability that the product of the two numbers is not 4?
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190124 还原机经选题: 文字题&几何
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P(A)=0.6, P(B)=0.75. What`s the minimum value of P(AB)?
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190124
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$$B_n$$=$$A_{n+1}$$-$$A_n$$,$$B_{n+1}$$-$$B_n$$=2.$$A_10$$=?
1:$$A_1$$=1,$$A_3$$=3
2:$$A_2$$=2,$$A_4$$=4
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190124
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Is n a factor of 30?
1: 30 can be divided by 2n.
2: 30 can be divided by $$n^{2}$$.
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